When a liquid freezes
A) the temperature of the substance increases.
B) the temperature of the substance decreases.
C) heat energy leaves the substance.
D) heat energy enters the substance.
C
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A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?
A person would like to pull a car out of a ditch. This person ties one end of a chain to the car’s bumper and wraps the other end around a tree so that the chain is taut. The person then pulls on the chain perpendicular to its length, as shown in the picture. The magnitude of the force that the chain exerts on the car in this situation is
A. Much smaller than the force the person exerts on the chain. B. About equal to the force the person exerts on the chain. C. Much bigger than the force the person exerts on the chain.
A solar or lunar eclipse will occur
a. when the Sun is near the line of nodes of the Moon, and the Moon is new or full. b. any time the Moon is new or full. c. when the Sun is near the solstice, and the Moon is new or full. d. half-way through an eclipse year. e. when the Sun is near the equinox, and the Moon is new or full.
The stars in our sky twinkle in brightness and color because of
A) turbulence in the Earth's atmosphere. B) rapid changes in the brightnesses and colors of stars caused by changes in their spectra. C) light pollution. D) the bubbling and boiling of gases on the surfaces of stars.